$$ \begin{aligned} 4(5n-7) &= 10n+2&& \text{simplify left side} \\[1 em]20n-28 &= 10n+2&& \text{move the $ \color{blue}{ 10n } $ to the left side and $ \color{blue}{ -28 }$ to the right} \\[1 em]20n-10n &= 2+28&& \text{simplify left and right hand side} \\[1 em]10n &= 30&& \text{ divide both sides by $ 10 $ } \\[1 em]n &= \frac{30}{10}&& \\[1 em]n &= 3&& \\[1 em] \end{aligned} $$

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